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Strengthen both your glutes and calves with this exercise: Lie with your back on the floor, legs extended fully, and heels on top of the fitness ball. Rest your arms on the floor by your sides. Slowly raise your buttocks off the floor while contracting your abs. Lower slowly, and repeat 10-15 times. If you are strong enough, don't let your buttocks reach the floor between repetitions, just lower them to a few inches above the floor before lifting again.